Chuck.



H.. A. SOHU'LTZ.

CHUCK.

APPLICATION NLRB APR49,1911

fin as pk i4 s prorftnm QI f whl shown Late Ween c n mea p D A eci eac bleh a lug maunt ain ne: cks,

@cham fr'y i knewnt all 3e E n @it the loxigarmgonveach of the bell cranks is ya `relatively longitudinal direction, the

[jaws being'moved inwardly or outwardly j 1n adirectionwhich is radial to the axis of the chuck. Y I

"l The-lever principle utilized to move the jawsinthe present device is capable of be- Ihgfapplied so as to establish almost any desired ratio between the forces exerted at the vpower and weight ends of the bell crank.

In a construction of chuck such as is illustrated, where the chuck body may be removed from the face plate, leaving only the 'bell cranks in proper relation with the stub shaft, it is possible' to substitute new and different levers wherein the ratio between the acting -forces will .be changed, so that .I the powerapplied as compared to the resulting movements, as well as the range of movement of the jaws, will be wholly different. It is manifest that in certain classes of work` such possibilities of adjustment yare A .a highly desirable end.

a this g, It obvious that, in I the invention disclosed, the jaws will always be moved 'toward or farther from "each other at equal speeds, thus insuring a centering of the work held thereby. If for anyreason the jaws should become decentered, correction' may be made through adjustment of one of the threaded stems 23, so as to bring the' @work into the axial line of the cliuck.-Y It is manifest that the principle utilized in my inventlon is applicable to chucks having two or-mo're vjaws, and for the better illustration have represented in Fig. 1v two f one of .which is arranged to engage with one of said jaws, and a member inengagement' with the other arm of each of said levers,` andv longitudinally movable within the chuck, whereby said jaws may be caused to move radially and innnison, said jaws cooperating wlth the member-'engaglng arm:VVV

of each of said levers to positively limit the swinging movement thereof in one direction,

substantially as described.

2. In a chuck, the combination of radially movable jaws, levers mounted within the chuck each-having angularly disposed arms one of which is arranged to engage with onefof said jaws, and a member in engagement with the Aother arm of each of said levers, and longitudinally movable within the chuck, whereby said jaws may be caused to move radially and in unison, said jaws `coperatingI 'with the member-engaging arm of each of said levers to positively limitthe swinging movement thereof in one direction, and said member coperating with the chuck body to positively limit the swinging movement of each of said levers in the opposite direction', substantially as described.

HERMAN A. SCHULTZ. Witnesses R. HANNHIIN, M. J. HaNNIFIn. 

